College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
Sci Total Environ. 2020 May 1;715:136723. doi: 10.1016/j.scitotenv.2020.136723. Epub 2020 Jan 15.
A graphene-like magnetic biochar (GLMB) was synthesized using lotus seedpod and potassium ferrate with simple step and applied for E2 adsorption. GLMB was characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS), Raman, X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and BET surface area. Several common (solution pH, ionic strength, humic acid and foreign ions) and new (AlO nanoparticles and microplastics (MPs)) water experiment conditions were investigated. Characterization results demonstrated that the sample was fabricated successfully and it possessed some graphene-like properties and a large surface area (828.37 m/g). Adsorption results revealed that the pseudo-second-order kinetics and Langmuir isotherm models could provide a better description for E2 uptake behavior. The E2 adsorption capacity could be influenced by solution pH, ionic strength and SO ions, and the effect of humic acid and background electrolyte (Na, K, Ca, Mg, Cl, NO, PO) could be neglected. The presences of AlO/MPs significantly decreased the time to reach adsorption equilibrium for E2 adsorption on GLMB, but had no obvious improvement or inhibiting effects on E2 removal when the adsorption reached equilibrium. The adsorption mechanism for E2 adsorption on GLMB was multiple, which involving π-π interactions, micropore filling effects, electrostatic interaction. The regeneration experiments showed that GLMB possessed a good regeneration performance. Based on the experimental results and comparative analysis with other adsorbents, GLMB was an economical, high-efficiency, green and recyclable adsorbent for E2 removal from aqueous solution.
一种类石墨烯磁性生物炭（GLMB）通过简单的步骤由莲子和高铁酸钾合成，并应用于 E2 的吸附。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、原子力显微镜（AFM）、X 射线光电子能谱（XPS）、拉曼、X 射线衍射（XRD）、振动样品磁强计（VSM）和 BET 表面积对 GLMB 进行了表征。考察了几种常见的（溶液 pH 值、离子强度、腐殖酸和共存离子）和新的（AlO 纳米颗粒和微塑料（MPs））水实验条件。表征结果表明，成功制备了该样品，其具有一些类石墨烯性质和较大的表面积（828.37 m/g）。吸附结果表明，准二级动力学和 Langmuir 等温线模型能够更好地描述 E2 的吸附行为。溶液 pH 值、离子强度和 SO 离子对 E2 吸附容量有影响，腐殖酸和背景电解质（Na、K、Ca、Mg、Cl、NO、PO）的影响可以忽略不计。AlO/MPs 的存在显著缩短了 GLMB 对 E2 吸附达到吸附平衡的时间，但对吸附达到平衡时 E2 去除没有明显的改善或抑制作用。E2 在 GLMB 上的吸附机制是多种的，包括 π-π 相互作用、微孔填充效应、静电相互作用。再生实验表明，GLMB 具有良好的再生性能。根据实验结果和与其他吸附剂的对比分析，GLMB 是一种经济、高效、绿色和可回收的用于从水溶液中去除 E2 的吸附剂。
